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Amorphous Bi-Ge-S(Se) Systems Studied by X-Ray Ge K Emission and Absorption Bands

100%

Drahokoupil J., Drbohlav I., Polčik M., Tichý L.

Acta Physica Polonica A

1994

vol. 86

issue 5

721-726

The X-ray Ge K absorption (emission) bands were measured in the stoichiometric glass system (GeS_{2})_{x}(Bi_{2}S_{3})_{1-x} (x = 0 ÷ 0.5) and in the Ge_{20}Bi_{y}Se_{80-y} system (y = 0, 7 and 13). The results do not confirm the existence of the Ge-Bi bond and they imply that the GeS_{2}-clusters are formed in both studied systems.

Effect of Compressive Load on Magnetic Shape Memory Effect in Ni-Mn-Ga Single Crystal

76%

Richterová K., Drahokoupil J., Kopecký V., Dragounová K., Landa M., Heczko O.

Acta Physica Polonica A

2015

vol. 128

issue 4

704-708

We investigated the effect of large compressive stress on magnetic shape memory effect in modulated 10M martensite of Ni-Mn-Ga Heusler alloy. The single crystalline sample deformed approximately elastically up to highest load 540 MPa. Structural and microstructural changes of a single crystal were analysed by X-ray diffraction 2D scan mapping in 2θ and ω. Although the crystal structure, lattice cell parameters, and twinned microstructure (a/b and modulation twinning) exhibited only small changes after the loading, the volume of the sample undergoing the magnetically induced reorientation decreased sharply while magnetic field necessary for the reorientation gradually increased. The extrapolation suggested that no magnetically induced reorientation might occur after compression of about 1 GPa.

Martensitic Transformation in Co-Based Ferromagnetic Shape Memory Alloy

64%

Kopeček J., Yokaichiya F., Laufek F., Jarošová M., Jurek K., Drahokoupil J., Sedláková-Ignácová S., Molnár P., Heczko O.

Acta Physica Polonica A

2012

vol. 122

issue 3

475-477

The Co_{38}Ni_{33}Al_{29} alloy in both powder and bulk state was investigated in the presented study using neutron diffraction on E9 high resolution powder diffractometer at HZB (BER II). The reverse martensitic phase transformation from the tetragonal martensitic phase into the cubic austenitic phase was observed with the phase coexistence within the temperatures from 183 K to 133 K. The fcc cobalt solid solution particles distributed in the transforming matrix remained in the same state through the whole temperature range. The obtained results agree with magnetization measurements on the same annealed sample. The powder data are compared with experiments on bulk sample, although there was a texture present. The obtained results provide further information about the phase transition process in this important class of ferromagnetic shape memory alloys.

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3 Acta Physica Polonica A

1 2015

1 2012

1 1994

3 Drahokoupil J.

2 Heczko O.

1 Dragounová K.

1 Drbohlav I.

1 Jarošová M.

1 Jurek K.

1 Kopecký V.

1 Kopeček J.

1 Landa M.

1 Laufek F.

1 Molnár P.

1 Polčik M.

1 Richterová K.

1 Sedláková-Ignácová S.

1 Tichý L.

1 Yokaichiya F.

Search results

Amorphous Bi-Ge-S(Se) Systems Studied by X-Ray Ge K Emission and Absorption Bands

Effect of Compressive Load on Magnetic Shape Memory Effect in Ni-Mn-Ga Single Crystal

Martensitic Transformation in Co-Based Ferromagnetic Shape Memory Alloy